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Description

Function of Quinones in Energy Conserving Systems covers the vast amount of research on the unique function of quinones in electron transfer and energy conserving systems. This book is organized into seven parts encompassing 39 chapters that focus on the quinone-protein interactions.
The opening part discusses the progression and status of research on ubiquinone proteins in mitochondria. This topic is followed by discussions on the electrochemical and spectral properties of quinones and semiquinones, as well as on a model for quinone-cytochrome electron-transfer reactions, with an emphasis on the derived kinetic advantages from altering the ubiquinol ionizability. The third part describes the properties and possible function of the quinone pool and the relationship and possible exchange between bulk phase and bound quinone. The subsequent parts look into the possible function of thermodynamically stable semiquinones and quinone binding proteins in mitochondria and photosynthetic systems. These parts also explore the application of inhibitory analogs and photoactivatable derivatives to identify the proteins that may interact directly with quinones. This text further discusses the function of plastoquinone in the photosynthetic reaction centers and the b-f complex. The concluding part examines the pathways of electron transfer in energy transducing membranes, with a particular emphasis on protonmotive mechanisms of quinone function.
This book will be of value to biologists, researchers, and biology teachers and students.

Table of Contents

Contributors
Preface
I Memorial Lecture
1. Ubiquinone Proteins in Cardiac Mitochondria
II Physical Chemistry of Biologically Active Quinones
1. Quinones of Value to Electron-Transfer Studies: Oxidation -Reduction Potentials of the First Reduction Step in an Aprotic Solvent
2. Electrochemical and Spectral Properties of Ubiquinone and Synthetic Analogs: Relevance to Bacterial Photosynthesis
3. Physical Chemistry of Semiquinones
4. A Physicochemical Model of Quinone-Cytochrome b-c Complex Electron Transfers
III Pool Function Behavior and Ubiquinone Mobility in Energy Conserving Membranes
1. Pool Function Behavior and Mobility of Isoprenoid Quinones
2. Studies on the Interactions and Mobility of Ubiquinone in Mitochondria! and Model Membranes
3. Lateral Diffusion of Ubiquinone in Mitochondrial Electron Transfer
4. Effects of Lipid Concentration and Fluidity on Oxidoreduction of Ubiquinone by Isolated Complex I, Complex III, and Complex I-III
5. Ubisemiquinone Does Not Have a Pool Function in the QH2: Ferricytochrome c Oxidoreductase
IV Thermodynamically Stable Semiquinones in Mitochondria and Photosynthetic Systems
1. Electron Transfer between Primary and Secondary Electron Acceptors in Chromatophores and Reaction Centers of Photosynthetic Bacteria
2. The Involvement of Stable Semiquinones in the Two-Electron Gates of Plant and Bacterial Photosystems
3. Enthalpy and Volume Changes Accompanying Electron Transfer from P870 to the Primary and Secondary Quinones in Photosynthetic Reaction Centers
4. The Secondary Electron Acceptor of Photosystem II
5. How Can We Reconcile the Notion of the "Transmembrane" Ubisemiquinone Pair with the Rapid Kinetics of Its Formation Observed with Complex II?
6. Function and Properties of a Semiquinone Anion Located in the QH2: Cytochrome c Oxidoreductase Segment of the Respiratory Chain
7. Ubisemiquinones in Electron-Transfer Systems of Mitochondria
V Quinone Binding Proteins in the Mitochondrial Respiratory Chain and Photosynthetic Systems
1. Quinones as Prosthetic Groups in Membrane Electron-Transfer Proteins I: Systematic Replacement of the Primary Ubiquinone of Photochemical Reaction Centers with Other Quinones
2. Quinones as Prosthetic Groups in Membrane Electron-Transfer Proteins II: The Interaction of the Reaction Center Secondary Quinone with the Q-b-c2 Oxidoreductase
3. Quinones as Prosthetic Groups in Membrane Electron-Transfer Proteins III: Functional Recognition of a Special Quinone Associated with the Ubiquinone-Cytochrome b-c1 Oxidoreductase of Beef Heart Mitochondria
4. The Multifarious Role of Ubiquinone in Bacterial Chromatophores
5. Quinone Binding Sites in Reaction Centers from Photosynthetic Bacteria
6. Two Small Peptides from Complex II and Their Role in the Reconstitution of Q Reductase Activity and in the Binding of TTF
7. Ubiquinone Binding Protein in the Cytochrome b-c1 Complex
8. Complex III Isolated in Triton X-100 as a Valuable System in Studying the Mechanism of Energy Conversion
9. Effects of 5-n-Undecyl-6-hydroxy-4,7-dioxobenzothiazole on the Reduction-Oxidation Reactions of the Cytochrome b-c1 Segment of Mammalian Mitochondria
10. Reconstitution of Electron-Transfer Reactions of the Mitochondrial Respiratory Chain with Iron-Sulfur Protein of the Cytochrome b-c1 Segment
VI Plastoquinone in Chloroplast Electron-Transfer Reactions
1. The Function of Plastoquinone in Electron Transfer
2. The Electrogenic Loop in Green Algae and Higher Plants: Carriers Involved, Relation to the Plastoquinone Pool, Coupling to the Transfer Chain
3. Inhibitors of Plastoquinone Function as Tools for Identification of Its Binding Proteins in Chloroplasts
4. Polypeptide Determinants of Plastoquinone Function in Photosystem II of Chloroplasts
5. Quinone Analogs and Their Interaction with the Chloroplast Electron-Transport Chain
VII Protonmotive Mechanisms of Quinone Function
1. The Function of Ubiquinone and Menaquinone in the Respiratory Chain of Escherichia coli
2. The Electron-Transport Chain of Rhodopseudomonas sphaeroides
3. Cycles and Q Cycles in Plant Photosynthesis
4. Differentiation between C and M Side Reactions of Ubiquinone Using Imposed Electron -Electrochemical Potential Gradient
5. The Proton Translocation Function of the Ubiquinone-Cytochrome c Oxidoreductase of Mitochondria
6. Pathways of Respiration-Coupled H+ Extrusion via Ubiquinone in Rat Liver Mitochondria
7. Protonmotive Mechanisms of Quinone Function
Index